Question: when is the {point in time} for {Melbourne} which has {population} as {4529500} ?
Paraphrase: At which point in time did Melbourne have a population of 4529500?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q3141 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '4529500')) . ?s pq:P585 ?value}